FreeBSD jail incompletely protects the access to the IPC primitives. The 'allow.sysvipc' setting only affects IPC queues, leaving other IPC objects unprotected, making them reachable system-wide independently of the system configuration. Versions 7.0 through 10.3 are affected. Proof of concept included.
e7bb338f4932b0dcb05045dbf728194cFreeBSD setrlimit stack clash proof of concept exploit.
6eba2939821ab24edba2b623a0df6a80FreeBSD FGPE stack clash proof of concept exploit.
a5bf5e251c7b1182eb8d9d86a7cba5ecFreeBSD FGPU stack clash proof of concept exploit.
4df3d0a41e548c26a0c180b85a467afbFreeBSD Security Advisory - ipfilter(4), capable of stateful packet inspection, using the "keep state" or "keep frags" rule options, will not only maintain the state of connections, such as TCP streams or UDP communication, it also maintains the state of fragmented packets. When a packet fragments are received they are cached in a hash table (and linked list). When a fragment is received it is compared with fragments already cached in the hash table for a match. If it does not match the new entry is used to create a new entry in the hash table. If on the other hand it does match, unfortunately the wrong entry is freed, the entry in the hash table. This results in use after free panic (and for a brief moment prior to the panic a memory leak due to the wrong entry being freed). Carefully feeding fragments that are allowed to pass by an ipfilter(4) firewall can be used to cause a panic followed by reboot loop denial of service attack.
52202a1372fafbdf07a4259245a5e409FreeBSD Security Advisory - A vulnerability was discovered in the NTP server's parsing of configuration directives. A vulnerability was found in NTP, in the parsing of packets from the DPTS Clock. A vulnerability was discovered in the NTP server's parsing of configuration directives. A vulnerability was found in NTP, affecting the origin timestamp check function. A remote, authenticated attacker could cause ntpd to crash by sending a crafted message. A malicious device could send crafted messages, causing ntpd to crash. An attacker able to spoof messages from all of the configured peers could send crafted packets to ntpd, causing later replies from those peers to be discarded, resulting in denial of service.
c169a99d362c1ddf8d4e9d7e28573baerldns is an open source lightweight DNS server for linux, netbsd, freebsd, and openbsd. Runs on x86 and x86_64 architectures.
fa1b4c747d0ea7b13c02993fbb0336e7rldns is an open source lightweight DNS server for linux, netbsd, freebsd, and openbsd. Runs on x86 and x86_64 architectures.
0ff54b024b64c4bf409da6fc84703fecFreeBSD Security Advisory - If an SSL/TLS server or client is running on a 32-bit host, and a specific cipher is being used, then a truncated packet can cause that server or client to perform an out-of-bounds read, usually resulting in a crash. There is a carry propagating bug in the x86_64 Montgomery squaring procedure. No EC algorithms are affected. Analysis suggests that attacks against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH are considered just feasible (although very difficult) because most of the work necessary to deduce information about a private key may be performed offline. The amount of resources required for such an attack would be very significant and likely only accessible to a limited number of attackers. An attacker would additionally need online access to an unpatched system using the target private key in a scenario with persistent DH parameters and a private key that is shared between multiple clients. Various other issues have also been identified.
61e028674e75cf79a6ef2b0daf4f97e0FreeBSD Security Advisory - The ssh-agent(1) agent supports loading a PKCS#11 module from outside a trusted whitelist. An attacker can request loading of a PKCS#11 module across forwarded agent-socket. When privilege separation is disabled, forwarded Unix domain sockets would be created by sshd(8) with the privileges of 'root' instead of the authenticated user. A remote attacker who have control of a forwarded agent-socket on a remote system and have the ability to write files on the system running ssh-agent(1) agent can run arbitrary code under the same user credential. Because the attacker must already have some control on both systems, it is relatively hard to exploit this vulnerability in a practical attack. When privilege separation is disabled (on FreeBSD, privilege separation is enabled by default and has to be explicitly disabled), an authenticated attacker can potentially gain root privileges on systems running OpenSSH server.
2022ff5492e80b6bf9eb7f85b3d2016fFreeBSD Security Advisory - Multiple vulnerabilities have been discovered in the NTP suite.
758701c6c332f8937e8764717b895f4aFreeBSD Security Advisory - A special combination of sysarch(2) arguments, specify a request to uninstall a set of descriptors from the LDT. The start descriptor is cleared and the number of descriptors are provided. Due to lack of sufficient bounds checking during argument validity verification, unbound zero'ing of the process LDT and adjacent memory can be initiated from usermode. This vulnerability could cause the kernel to panic. In addition it is possible to perform a local Denial of Service against the system by unprivileged processes.
2928e81b104e6f66784c2fc8aa82ca7eFreeBSD Security Advisory - The implementation of bspatch does not check for a negative value on numbers of bytes read from the diff and extra streams, allowing an attacker who can control the patch file to write at arbitrary locations in the heap. This issue was first discovered by The Chromium Project and reported independently by Lu Tung-Pin to the FreeBSD project. An attacker who can control the patch file can cause a crash or run arbitrary code under the credentials of the user who runs bspatch, in many cases, root.
82e698f904115c3510c38a29f992e781FreeBSD Security Advisory - Multiple vulnerabilities have been discovered in the NTP suite.
fce94472a944196f57b09c666a948569FreeBSD Security Advisory - The implementation of the TIOCGSERIAL ioctl(2) does not clear the output struct before copying it out to userland. The implementation of the Linux sysinfo() system call does not clear the output struct before copying it out to userland. An unprivileged user can read a portion of uninitialised kernel stack data, which may contain sensitive information, such as the stack guard, portions of the file cache or terminal buffers, which an attacker might leverage to obtain elevated privileges.
1e15711ef418910a989c906474f5221cFreeBSD Security Advisory - The cpio(1) tool from the libarchive(3) bundle is vulnerable to a directory traversal problem via absolute paths in an archive file. A malicious archive file being unpacked can overwrite an arbitrary file on a filesystem, if the owner of the cpio process has write access to it.
274629714de89c0dd89194957e9ee690FreeBSD Security Advisory - An integer signedness error in the archive_write_zip_data() function in archive_write_set_format_zip.c in libarchive(2) could lead to a buffer overflow on 64-bit machines. An attacker who can provide input of their choice for creating a ZIP archive can cause a buffer overflow in libarchive(2) that results in a core dump or possibly execution of arbitrary code provided by the attacker.
4e380ba863ed7b8823111e3484f3780eFreeBSD Security Advisory - The implementation of historic stat(2) system call does not clear the output struct before copying it out to userland. An unprivileged user can read a portion of uninitialised kernel stack data, which may contain sensitive information, such as the stack guard, portions of the file cache or terminal buffers, which an attacker might leverage to obtain elevated privileges.
050fa392be53d3265e4e182e8ba729dfFreeBSD Security Advisory - Incorrect argument handling in the socket code allows malicious local user to overwrite large portion of the kernel memory. Malicious local user may crash kernel or execute arbitrary code in the kernel, potentially gaining superuser privileges.
4d6effae01c6a211307b96d8442db080FreeBSD Security Advisory - Incorrect signedness comparison in the ioctl(2) handler allows a malicious local user to overwrite a portion of the kernel memory. A local user may crash the kernel, read a portion of kernel memory and execute arbitrary code in kernel context. The result of executing an arbitrary kernel code is privilege escalation.
db2cefadc213a78dbd47951a813ce706FreeBSD Security Advisory - The padding check in AES-NI CBC MAC was rewritten to be in constant time by making sure that always the same bytes are read and compared against either the MAC or padding bytes. But it no longer checked that there was enough data to have both the MAC and padding bytes. [CVE-2016-2107] An overflow can occur in the EVP_EncodeUpdate() function which is used for Base64 encoding of binary data. [CVE-2016-2105] An overflow can occur in the EVP_EncryptUpdate() function, however it is believed that there can be no overflows in internal code due to this problem. [CVE-2016-2106] When ASN.1 data is read from a BIO using functions such as d2i_CMS_bio() a short invalid encoding can casuse allocation of large amounts of memory potentially consuming excessive resources or exhausting memory. [CVE-2016-2109] ASN1 Strings that are over 1024 bytes can cause an overread in applications using the X509_NAME_oneline() function on EBCDIC systems. [CVE-2016-2176] FreeBSD does not run on any EBCDIC systems and therefore is not affected. A MITM attacker can use a padding oracle attack to decrypt traffic when the connection uses an AES CBC cipher and the server support AES-NI. [CVE-2016-2107] If an attacker is able to supply very large amounts of input data then a length check can overflow resulting in a heap corruption. [CVE-2016-2105] Any application parsing untrusted data through d2i BIO functions are vulnerable to memory exhaustion attack. [CVE-2016-2109] TLS applications are not affected.
0cd350926d2b0a4e5eb3cc47ba9a5d7dCore Security Technologies Advisory - An integer signedness error has been found in the amd64_set_ldt() function in the FreeBSD kernel code (define d in the /sys/amd64/amd64/sys_machdep.c file), which implements the i386_set_ldt system call on the amd64 version of the OS. This integer signedness issue ultimately leads to a heap overflow in the kernel, allowing local unprivileged attackers to crash the system. FreeBSD 10.2 amd64 is affected.
5fddced07d5ad899ebb2d9c6bf48f392FreeBSD Security Advisory - A special combination of sysarch(2) arguments, specify a request to uninstall a set of descriptors from the LDT. The start descriptor is cleared and the number of descriptors are provided. Due to invalid use of a signed intermediate value in the bounds checking during argument validity verification, unbound zero'ing of the process LDT and adjacent memory can be initiated from usermode. This vulnerability could cause the kernel to panic. In addition it is possible to perform a local Denial of Service against the system by unprivileged processes.
708f3ca1de7547e635db4e1854a95614FreeBSD Security Advisory - Due to insufficient input validation in OpenSSH, a client which has permission to establish X11 forwarding sessions to a server can piggyback arbitrary shell commands on the data intended to be passed to the xauth tool. An attacker with valid credentials and permission to establish X11 forwarding sessions can bypass other restrictions which may have been placed on their account, for instance using ForceCommand directives in the server's configuration file.
46da5195f39572d7796a4a8faa2321a1FreeBSD Security Advisory - A cross-protocol attack was discovered that could lead to decryption of TLS sessions by using a server supporting SSLv2 and EXPORT cipher suites as a Bleichenbacher RSA padding oracle. Note that traffic between clients and non-vulnerable servers can be decrypted provided another server supporting SSLv2 and EXPORT ciphers (even with a different protocol such as SMTP, IMAP or POP3) shares the RSA keys of the non-vulnerable server. This vulnerability is known as DROWN. Various other issues were also addressed.
9ba68b8ddba8c9076b272b296999095c
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